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Search Results: 1 - 10 of 486382 matches for " S. R. Foltyn "
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Benefits of current percolation in superconducting coated conductors
N. A. Rutter,J. H. Durrell,M. G. Blamire,J. L. MacManus-Driscoll,H. Wang,S. R. Foltyn
Physics , 2005, DOI: 10.1063/1.2093920
Abstract: The critical currents of MOD/RABiTS and PLD/IBAD coated conductors have been measured as a function of magnetic field orientation and compared to films grown on single crystal substrates. By varying the orientation of magnetic field applied in the plane of the film, we are able to determine the extent to which current flow in each type of conductor is percolative. Standard MOD/RABiTS conductors have also been compared to samples whose grain boundaries have been doped by diffusing Ca from an overlayer. We find that undoped MOD/RABiTS tapes have a less anisotropic in-plane field dependence than PLD/IBAD tapes and that the uniformity of critical current as a function of in-plane field angle is greater for MOD/RABiTS samples doped with Ca.
Strongly Enhanced Current Densities in Superconducting Coated Conductors of YBa2Cu3O7-x + BaZrO3
J. L. MacManus-Driscoll,S. R. Foltyn,Q. X. Jia,H. Wang,A. Serquis,L. Civale,B. Maiorov,M. E. Hawley,M. P. Maley,D. E. Peterson
Physics , 2004, DOI: 10.1038/nmat1156
Abstract: There are numerous potential applications for superconducting tapes, based on YBa2Cu3O7-x (YBCO) films coated onto metallic substrates. A long established goal of more than 15 years has been to understand the magnetic flux pinning mechanisms which allow films to maintain high current densities out to high magnetic fields. In fact, films carry 1-2 orders of magnitude higher current densities than any other form of the material. For this reason, the idea of further improving pinning has received little attention. Now that commercialisation of conductors is much closer, for both better performance and lower fabrication costs, an important goal is to achieve enhanced pinning in a practical way. In this work, we demonstrate a simple and industrially scaleable route which yields a 1.5 to 5-fold improvement in the in-field current densities of already-high-quality conductors.
Angular dependent vortex pinning mechanisms in YBCO coated conductors and thin films
L. Civale,B. Maiorov,A. Serquis,J. O. Willis,J. Y. Coulter,H. Wang,Q. X. Jia,P. N. Arendt,J. L. MacManus-Driscoll,M. P. Maley,S. R. Foltyn
Physics , 2003, DOI: 10.1063/1.1655707
Abstract: We present a comparative study of the angular dependent critical current density in YBa2Cu3O7 films deposited on IBAD MgO and on single crystal MgO and SrTiO3 substrates. We identify three angular regimes where pinning is dominated by different types of correlated and uncorrelated defects. We show that those regimes are present in all cases, indicating that the pinning mechanisms are the same, but their extension and characteristics are sample dependent, reflecting the quantitative differences in texture and defect density. In particular, the more defective nature of the films on IBAD turns into an advantage as it results in stronger vortex pinning, demonstrating that the critical current density of the films on single crystals is not an upper limit for the performance of the IBAD coated conductors.
Scientific Annals of the Alexandru Ioan Cuza University of Iasi : Economic Sciences Series , 2010,
Abstract: The problem of long term public investment appraisal, especially those affecting future generations is a complex issue consisting of the questions of the valuation of inputs and outputs, uncertainty and the problem of dealing with effects emerging in different moments of time. The last problem is usually solved by using discounting procedure.The paper aims at analyzing the definition of the discount rate in project appraisal procedure in the light of effectiveness and justice of inter-generational investment decision making. The analysis includes answering the question of the rationale for discounting in short perspective in certain appraisal procedures concerning efficient and just decision criteria. Then, selected ethical approaches to future generations rights are presented as the basis for establishing the connection between the discount rate and inter-generational justice. Finally, various levels of discount rate are analyzed assuming different rights assignment to present and future generations.
Gambling with superconducting fluctuations
Marek Foltyn,Maciej Zgirski
Physics , 2014,
Abstract: Superconducting nanowires and Josephson junctions, when biased close to superconducting critical current, can switch to a non-zero voltage state by thermal or quantum fluctuations. The process is understood as an escape of a Brownian particle from a metastable state. Since this effect is fully stochastic, we propose to use it for generating random numbers. We present protocol for obtaining random numbers and test the experimentally harvested data for their fidelity.
Risk and Subsidies in Czech Agriculture - an ex-ante Analysis of Farmers′ Decision-making
L. Jelínek,I. Foltyn,J. ?picka,T. Ratinger
AGRIS on-line Papers in Economics and Informatics , 2010,
Abstract: This paper deals with the ex-ante analysis of the effects of farm subsidies on farm behaviour. Beside that the riskfactor is implemented in the farm model to reflect and quantify potential (negative) impact on farm results. Afarm-level optimization model is used to assess the effects of different kind of policies and risk on productionstructure, income indicators and land use management. It appeared that a reasonable level of risk (via incomevariation) have impact, but not significant. If liberalisation would have happened (zero direct anddisadvantageous payments) production would homogenised, 30% of land would remained abandoned,production and income would clearly decline. Other scenario points out that environmental objectives (herethrough more extensively managed land) could not be necessarily more costly, but in such a case withoutaccompanying livestock. To increase profitable livestock production requires to provide grassland and animalpayments above the current level (obviously in addition to stimulating production economizing) whereas bothpayments should be conditional to each other.
Automated detection of organophosphate warfare gases (nerve agents) in air based on micro-SIA - lab-on-valve system
Ondrej Pavlicek,Miroslav Polasek,Martin Foltyn,Jiri Cabal
Journal of Applied Biomedicine , 2013,
Abstract: Equipment for fast and accurate detection of organophosphate nerve agents is developed and tested. The method is based on the spectrophotometric monitoring of the enzyme activity of butyrylcholinesterase after its contact with air in a special absorption unit (a “scrubber”) developed for the purpose. The scrubber was made from a glass tube filled with glass beads (diam. 3 mm) and filled with approx. 5 ml of butyrylcholinesterase in a phosphate buffer of pH 7.4. The air sample was bubbled through this solution for 20 s at a flow rate of 80 l hour-1. Thereafter 8 microl of the enzyme solution were aspirated into the micro-SIA-LOV analyzer and the activity of the enzymes were evaluated by using Ellman’s reagent, i.e. 2.5 mmol l-1 butyrylthiocholine iodide and 0.25 mmol 5,5’-dithiobis (2-nitrobenzoic acid). The absorbance of the coloured reaction product was measured at 412 nm after the reaction time of 60 s. The residue of the absorption liquid was washed away from the absorber and the system was washed with the enzyme solution prior to next analysis. The contaminated air caused partial inhibition of the enzyme activity of the absorption liquid. The activity of the contaminated sample was compared with the activity of the unaffected enzyme (blank measurement). The analysis was controlled by two PCs. The effect of the concentration of analyte in the absorption liquid on the enzyme activity was tested for 10-5-10-9 mol l-1 sarin. A single analysis (including the absorption step) took <130 s.
Economic Dispatch with Multiple Fuel Options Using CCF  [PDF]
R. Anandhakumar, S. Subramanian
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.32015
Abstract: This paper presents an efficient analytical approach using Composite Cost Function (CCF) for solving the Economic Dispatch problem with Multiple Fuel Options (EDMFO). The solution methodology comprises two stages. Firstly, the CCF of the plant is developed and the most economical fuel of each set can be easily identified for any load demand. In the next stage, for the selected fuels, CCF is evaluated and the optimal scheduling is obtained. The Proposed Method (PM) has been tested on the standard ten-generation set system; each set consists of two or three fuel options. The total fuel cost obtained by the PM is compared with earlier reports in order to validate its effectiveness. The comparison clears that this approach is a promising alterna-tive for solving EDMFO problems in practical power system.
Design of Multilingual Speech Synthesis System  [PDF]
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21008
Abstract: The main objective of this paper is to convert the written multilingual text into machine generated synthetic speech. This paper is proposed in order to provide a complete multilingual speech synthesizer for three languages Indian English, Tamil and Telugu. The main application of TTS system is that it will be helpful for blind and mute people that they could have the text read to them by computer. TTS system will help in retrieving the information from sites that contain information in different languages. It can be used in educational institutions for pronunciation teaching of different languages. We use concatenative speech syn-thesis where the segments of recorded speech are concatenated to produce the desired output. We apply prosody which makes the synthesized speech sound more like human speech. Smoothing is also done to smooth the transition between segments in order to produce continuous output. The Optimal Coupling algorithm is enhanced to improve the performance of speech synthesis system.
PCRR Based Bandpass Filter for C and L+U Bands of ITU-T G.694.2 CWDM Systems  [PDF]
S. Robinson, R. Nakkeeran
Optics and Photonics Journal (OPJ) , 2011, DOI: 10.4236/opj.2011.13024
Abstract: A two Dimensional (2D) Photonic Crystal Ring Resonator (PCRR) based Bandpass Filter (BPF) is designed to cover C and L+U bands of Coarse Wavelength Division Multiplexing (CWDM) systems. It is devised with two quasi waveguides and a circular PCRR. The simulation results are obtained using 2D Finite Difference Time Domain (FDTD) method. The Photonic Band Gap (PBG) is calculated by Plane Wave Expansion (PWE) method. The BPFs allow the entire C-band (BPF1) and L+U bands (BPF2), which are extended from 1530 to 1565 nm (C band) and 1565 to 1675 nm (L+U bands). The computed bandwidth of BPF1 and BPF2 is 32 nm and 97 nm respectively. The size of the device is minimized from a scale of few tens of millimeters to the order of micrometers. The overall size of the BPF1 is around 12.8 µm × 11.4 µm and 11.4 µm × 11.4 µm for BPF2.
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